Coal screening and grading apparatus.



' PATENTED MAR. 5, 1907.

J. RAPP.

COAL SCREENING AND GRADING APPARATUS.

APPLICATION FILED 00T. 22. 1906.

, lowing is a UNITED STATES PATENT OEEIOE.

JOSEPH RAPP, OF coLLINSvILLE, ILLINOIS, ASSIGNOR OF ONE-FOURTH To LOUIS F. LUMAGHI., or coLLINSvILLE, ILLINOIS, AND ONE-FOURTH To JOSEPH D..-LUMAGHI, OF ST. LOUIS, MISSOURI.

COAL SCREENING AND GRADING APPARATUS'.

application nea october 22,1906. seria No. 339,932.

.To aZZ whom it may concern:

Beit known that I, JOSEPH RAPP, a citizen of the Umted States of America, residing in Collinsville, in the county of Madison vand State of Illinois, have inventedcertain new. and useful Improvements in Coal Screening and Gradin Apparatuses,v of which the folll, clear, and exact description,

reference. being had to the accompanying drawings, forming part of this specification.

My invention relates to an apparatus for screening and grading coaland depositing the various grades lin distinct bins or receptacles.

.Figure I is a view, partly in side elevation and partly in vertical section, of my apparatus. Fig. II is an enlarged vertical crosssection taken on line II II, Fig. I. Fig. III

is an enlarged longitudinal vertical section taken through the refuse-receptacle of the. apparatus.

A, B, C, D, and E designate a series of bins into which the screened and graded coal is deposited, the bin A, as herein shown, being designed to receive the largest coal, the bin E the smallest, andthe bins B, C, and D the intermediate sizes of coal.

a, b, c, and d are chutes leading to the bins A, B, C, and D, respectively, these chutes having preferably mounted therein iights on which the' coal travels in its descent tothe bins, as indicated at a and'b, Fig. I.

1, 2, 3, 4, and 5 designate open-ended rotary screens located at the top of the apparatus and stepped downwardly relative to each other in the order named in order that they may successively receive the coal being screened and graded in such manner that the. coal passing through the irst screen will be screened andthe largest-sized coalv delivered into the bin A through the chute a from the open end of the first screen and that passing through the mesh of the screen be delivered into the second screen, and so on throughout the series of screens to provide for the largest coal being in such instance' delivered to the vbin .to which the screen corresponds and the smaller coal being delivered to the next-succeeding screen.' The screens are of gradually-decreasing mesh from the rst of the se-y ries tothe las-tof the series. lThe coal dis-l charged romthe final `screen 5`rpasses over a guard-plate finstead of through a'chute, a-

Specication of Letters Patent.

contain a quantity of water.

Patented March 5, 1907.

l chute at the location of this screen being unl necessary 1n view of the closeV proximity of the screen to the bin E, into which the coal is delivered. Each of the screens is rotated by power applied thereto in any Suitable manner, andthe screens are preferably sup orted at their forward ends at least by rol ers 7, 6o that are journaled to suitable supports-for instance, the chutes through which the coal descends to they bins and the guard-plate.

1, z', 3", and 4 arerunways located beneath the s creens 1 to 4, inclusive, .and onto 65 Vwhich the smaller-sized coal which passes through the meshes of these screens descends to be delivered into the succeeding screens.

These runways extend through the various chutes of the a paratus through which the 7o larger-sized coalpis delivered tothe bins, and for the purpose of. preventing the largersized coal from-entering into the runways while descending through the chutes I provide a hood 8 above each runway within the 75 chute through which the runway passes, as seen in Figs. I and II. The ,coal to be screened is first delivered through a trou h 9 into a settling-tank 10,'which is adapte to 8o 11 is an elevator, preferably of bucket type, which operates in the Settling-tank 10 and is driven by power ap lied thereto in any suitable manner, this e eva'tor extending upwardly to the top of the apparatus, and the coal gathered thereby from thesettlingtank is delivered from the elevator to the first or topmost rotary screen 1 through a runway 12, after which it follows the course through the screens, hereinbefore described, 9o to be-screened and graded.

13 designates a water-conducting pipe, to which is connected a series of sprayipes 14,'v that extend through the forward en s ofthe .rotary screens in the Opposite direction to that in whichrthe Inaterlal travels for the purpose of spraying .the Ainterior of said screens andl preventing clogging thereof by clayor other adhesive substance present in the coal.

. ICO 15 designates a refuse-receiving receptacle, preferably. having an inclined bottom,

and' having the highest portion of said bottom located at its rear end. The reuse which asses 'through the final rotary screen 105 5 is de ivered to the receptacle 15 through a pipes trough 16 located beneath said final screen. i In the refuse-receptacle is a perforated screen-plate 17, onto Which the ne lumps `ot coal which pass through the inal screen are delivered from lthe trough 16. These iine i lumps of coal are iushed across said screenplate by the Water delivered from the spray- 14 and descend to and through the nal rotary screen, and from the refuse-receptacle the :line lumps ofcoal are conducted to the vsettling-tank 1()Y vthrough a return runway 18. 19 is a conveyer that operates in the refusereceptacle- 15. This conveyer-is driven by oWer suitably applied thereto and acts to gischargethe clay or other refuse deposited in said' receptacle over the high end of:- the bottom of the receptacle and onto a discharge-trough 20, which. leads, preferably, to one side ofthe apparatus.

I claim- -.1. in an apparatus of the. character devw scribed, the combination of a plurality of rotatable screens having open ends and arranged inia stepped series and at varying' elevations, means for delivering material yto the uppermost of said screens, a vertical chute for receiving the material discharged through the open end of the higher screen, andhaving a runway-section extending across the chamber thereof and a hood covering the runwaysection for deflecting the material to opposite sides'ot1 the runway-section, a runway lol cated beneath the higher screen 'for conducting* the screened material from the higher substantially as set forth.`

saegiao screen to the runway-section Within the ver tical chute, and a runway conducting the material from` the runway-section Within the vertical chute to a screen located at a lower level, substantially as set forth. v

2. ln an apparatus of the character described, the combination of a plurality of rotatable screens, means for delivering the screened material from one to another of said screens, a refuse-receptacle, means for 45' conducting the refuse material discharged jfrom the final one of 'said'screens to said refuse-receptacle, a screen 1n said refuse-receptacle, a settling-tank, and a conductingv member leading from saidt refuse-receptacle screen tosaid settling-tank, substantially as: 4set forth..

o 43. ln: an apparatus ofthe character dea scribed, the combination of a plurality of ro,-

tatable screens, a settling-tank, a conveyer for .conducting the material to be screened from settling-tank to the irst of said screens, means for conducting screened material from one to, another of said screens, means for conducting material discharged "through the mesh of the final one of said rotatable screens, a refuse-receptacle into which the material discharged from ysaid nal screen/is conducted, and a tr'ough leading from said receptacle to said settling-tank,

JOSEPH RAPP.

In presence ofl BLANCHE HOGAN,

NELLiE V. ALEXANDER. 

